The SiMS6R4/R4-6D3 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 6.3 to 6.6 GHz, Center Frequency 6.45 GHz, Insertion Loss 2.5 dB, Rejection 30 dB @5.85GHz&7GHz, 40 dB @5.8GHz&7.2GHz, 60 dB @DC~4GHz, 50 dB @10~15GHz, Upper Rejection 30 to 50 dB. Tags: Surface Mount, Cavity Filter. More details for SiMS6R4/R4-6D3 can be seen below.